Series and Odd Man out Practice Test 8

Concept:Identify the incorrect term by checking whether the differences follow a consistent pattern.Explanation:Find the differences: $3-1=2$, $7-3=4$, $19-7=12$, $42-19=23$, $89-42=47$, $184-89=95$.The pattern should be: each difference equals $2 \times$ the previous difference $+1$.First difference is $2$.Expected second difference is $2 \times 2 + 1 = 5$, but the actual second difference is $4$.So the term $7$ is wrong.The correct term should be $3 + 5 = 8$.The corrected series is $1, 3, 8, 19, 42, 89, 184$.Its differences are $2, 5, 11, 23, 47, 95$, which satisfy the pattern.Answer:The wrong number is $7$, and it should be replaced by $8$.Correct option is A.